I had some medium training when I was younger.
(Got into spiritualism for a while when I was feeling lost and lonely and when I was young I searched for meaning in religions etc)
I did a few readings. Never for money or any other form of recompense. My intentions & motivation were completely innocent & the only self-interest was, I suppose, in seeking for a deeper meaning in life (not fool enough to think that everyone who reads this will believe me when I say that).
I don't know a huge amount about cold reading, but looking back I think much of what I picked up on was natural intuition & the ability to read body language. I don't mean in such a way as meant to deceive, but more like when you notice someone is tense or worried.
Everyone experiences a full range of emotions in life so it's not hard for the person getting a reading to read more meaning into what is being said.
That said, I've also experienced things I've not been able to explain. Examples: Images flashing up in my mind for example which are seemingly totally random. And unlike what one pictures when one thinks about something in the normal course of thinking or remembering, they've been very sharp and appeared on a white background. Each time when this occurred and I mentioned it - however odd or bizarre it was to me - it really struck a chord with the person I was talking to and seemed to be especially specific to them. Could only go on their affirmations - didn't make any sense to me.
So, who knows where those came from and these days I don't know what I believe. I've had a few readings myself in the past, some brought me comfort, most seemed like rubbish.
Just sharing to give a different perspective. Don't have any skin in the game one way or another. But always on these threads the over-riding opinion is that 'mediums' are charlatans, cruel and deliberately deceitful, preying on the vulnerable etc, when - sure some are - but I think others are just people who have a genuine belief system and are acting in good faith.
Mediumship readings are mutually-affirming when you think about it...if someone is acting in good faith they're not likely to realise they've inadvertently done a cold-reading if (1) no one tells them they're wrong or (2) it affirms their belief system
'Mediumship' woolly and vague... I believe most people who do readings do so with good (or at least neutral) intentions - same with anything.
(Apologies for dreadful sentence structure, I should have been asleep ages ago and am too tired & sore-eyed to be looking at a screen, let alone one on an ancient mobile! )